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Advanced 102018

 
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immpy



Joined: 06 May 2017
Posts: 571
PostPosted: Sun Oct 21, 2018 1:06 am    Post subject: Advanced 102018 Reply with quote
Hello everyone, enjoy the puzzle...

Code:

+-------+-------+-------+
| . 5 9 | 1 . 6 | . . . |
| . 6 . | 2 . 7 | 1 . 5 |
| . . 8 | . 4 . | . . . |
+-------+-------+-------+
| . . . | . . 1 | 5 . . |
| . 1 3 | . . . | 9 2 . |
| . . 5 | 4 . . | . . . |
+-------+-------+-------+
| . . . | . 3 . | 8 . . |
| 5 . 7 | 8 . 2 | . 6 . |
| . . . | 5 . 4 | 2 3 . |
+-------+-------+-------+

Play this puzzle online at the Daily Sudoku site

cheers...immp
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Ajò Dimonios



Joined: 01 May 2017
Posts: 339
Location: Sassari Italy
PostPosted: Sun Oct 21, 2018 10:18 am    Post subject: Reply with quote
Hi everyone.
Code:

+----------------+----------+----------+
| 27    5    9   | 1  8   6 | 3  47 24 |
| 3     6    4   | 2  9   7 | 1  8  5  |
| 1     27   8   | 3  4   5 | 67 9  26 |
+----------------+----------+----------+
| 24678 2478 26  | 9  267 1 | 5  47 3  |
| 467   1    3   | 67 5   8 | 9  2  46 |
| 2679  279  5   | 4  267 3 | 67 1  8  |
+----------------+----------+----------+
| 246   24   126 | 67 3   9 | 8  5  17 |
| 5     3    7   | 8  1   2 | 4  6  9  |
| 689   89   16  | 5  67  4 | 2  3  17 |
+----------------+----------+----------+

Play this puzzle online at the Daily Sudoku site.

One step after basics
If R1C1=2=>contradiction =>-2R1C1=>solution
2R1C1-2R7C1; 2R1C1-(2=4)R1C9-4R5C9=4R5C1-4R7C1 and 2R1C1-2R1C9=(2-6)R3C9=6R5C9-6R5C4=6R7C4-6R7C1=>R7C1=>Ø therefore the initial hypothesis R1C1 = 2 is incorrect and consequently R1C1 = 7 is true.R1C1=7=>stte.

Ciao a Tutti
Paolo
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Clement



Joined: 24 Apr 2006
Posts: 1111
Location: Dar es Salaam Tanzania
PostPosted: Wed Oct 24, 2018 3:04 pm    Post subject: Advanced 102018 Reply with quote
Code:

+-------------------------+------------------+------------------+
|h27         5        9   | 1      8       6 | 3      47     24 |
| 3          6        4   | 2      9       7 | 1      8      5  |
| 1          2-7      8   | 3      4       5 |a67     9      26 |
+-------------------------+------------------+------------------+
|d24678     d2478     26  | 9      267     1 | 5     c47     3  |
|e4*67       1        3   |e67^    5       8 | 9      2     e46 |
| 2679       279      5   | 4      267     3 |b67     1      8  |
+-------------------------+------------------+------------------+
|g246        24       126 |f67     3       9 | 8      5      17 |
| 5          3        7   | 8      1       2 | 4      6      9  |
| 89         89       16  | 5      67      4 | 2      3      17 |
+-------------------------+------------------+------------------+

(7)r3c7 = r6c7 - (7=4)r4c8 - r4c12 = (4*67^)r5c149 - (7^=6)r7c4 - (4*6=2)r7c1 - (2=7)r1c1 => - 7r3c2; stte
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immpy



Joined: 06 May 2017
Posts: 571
PostPosted: Wed Oct 24, 2018 11:14 pm    Post subject: Reply with quote
Yes indeed, those sure work nicely. I took a somewhat longer route, so I'll just admire your elegance.

cheers...immp
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